iOS实现循环滚动公告栏

本文实例为大家分享了ios实现循环滚动公告栏的具体代码，供大家参考，具体内容如下

封装了一个继承于uiview的类，如下：

#import <uikit/uikit.h>
 
ns_assume_nonnull_begin
@interface xtaynoticescrollview : uiview
 
- (instancetype)initwithframe:(cgrect)frame titlearray:(nsarray<nsstring *> *)titlearray; 
- (void)opentimer;    
- (void)closetimer;
 
@end
 
ns_assume_nonnull_end

#define row_h  self.bounds.size.height
 
#import "xtaynoticescrollview.h"
 
@interface xtaynoticescrollview ()
 
/// scrollview
@property (nonatomic, strong) uiscrollview *bgscrollview;
/// titlearr
@property (nonatomic, copy) nsarray *titlearr;
/// timer
@property (nonatomic, strong) nstimer *scrolltimer;
 
@end
 
@implementation xtaynoticescrollview
 
- (instancetype)initwithframe:(cgrect)frame titlearray:(nsarray<nsstring *> *)titlearray {
  self = [super initwithframe:frame];
  if (self) {
    self.titlearr = titlearray;
    [self addsubview:self.bgscrollview];
    [self createbaseview];
    [self opentimer];
  }
  return self;
}
 
// mark: - 开启定时器
- (void)opentimer {
  if (!_scrolltimer) {
    _scrolltimer = [nstimer scheduledtimerwithtimeinterval:3 target:self selector:@selector(timermoved) userinfo:nil repeats:yes];
    [[nsrunloop currentrunloop] addtimer:_scrolltimer formode:nsrunloopcommonmodes];
  }
}
 
// mark: - 关闭定时器
- (void)closetimer {
  [_scrolltimer invalidate];
  _scrolltimer = nil;
}
 
- (uiscrollview *)bgscrollview {
  if (!_bgscrollview) {
    _bgscrollview = [[uiscrollview alloc] initwithframe:self.bounds];
    _bgscrollview.scrollenabled = no;
    _bgscrollview.showsverticalscrollindicator = no;
    _bgscrollview.showshorizontalscrollindicator = no;
    _bgscrollview.backgroundcolor = uicolor.whitecolor;
  }
  return _bgscrollview;
}
 
// mark: - 创建所有视图
- (void)createbaseview {
  // 安全判断
  if (self.titlearr.count == 0) {
    return;
  }
  // 为了展示滑动过程的流畅性，重新处理数组
  nsmutablearray *datamarray = [nsmutablearray arraywithcapacity:0];
  [datamarray addobjectsfromarray:_titlearr];
  [datamarray addobject:_titlearr.firstobject];
  for (int i = 0; i<datamarray.count; i++) {
    uilabel *label = [[uilabel alloc] initwithframe:cgrectmake(0, row_h*(i%datamarray.count), self.bgscrollview.bounds.size.width, row_h)];
    label.text = datamarray[i];
    label.font = [uifont systemfontofsize:15];
    label.textcolor = [uicolor blackcolor];
    label.numberoflines = 0;
    [_bgscrollview addsubview:label];
  }
  _bgscrollview.contentsize = cgsizemake(0, row_h*datamarray.count);
}
 
// mark: - 定时器调用方法
- (void)timermoved {
  cgfloat pagey = self.bgscrollview.contentoffset.y/row_h;
  int pageinty = pagey;
  if (pageinty >= self.titlearr.count) {
    [self.bgscrollview setcontentoffset:cgpointmake(0, 0) animated:no];
  } else {
    [self.bgscrollview setcontentoffset:cgpointmake(0, (pageinty+1)*row_h) animated:yes];
  }
}

vc调用代码：

xtaynoticescrollview *notiview = [[xtaynoticescrollview alloc] initwithframe:cgrectmake(50, 100, self.view.frame.size.width-100, 50) titlearray:@[@"我是第一个数据-11111111111111", @"我是第二个数据-2222222", @"我是第三个数据-33333333"]];
  
[self.view addsubview:notiview];

运行后的效果视频：

公告内容用的label，无点击效果，若需要。替换为button，添加手势，都可以。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。